After studies at the Warsaw Theological Academy (now: Cardinal Stefan Wyszyński University in Warsaw) he earned on 15 May 1995 the Licentiate, on 8 June 1998 the Doctorate and in 2005 the Habilitation with his book: Katecheza o małżeństwie i rodzinie w Polsce po Soborze Watykańskim II.
("Religious education in the Families in Poland after the Second Vatican Council") at the Pontifical University of John Paul II.
Stala was a priest of Tarnów diocese, Associate Professor of Catechetics and Vice Dean for Research, Development and Cooperation and the Head of the Research Section of Pedagogical and Catechetical Studies at the Pontifical University of John Paul II in Cracow (UPJPII), Theology Faculty, Section in Tarnów (WTST).
He was also co-ordinator of Erasmus Programme at the WTST and editor in chief of the international scientific journal The Person and the Challenges.
[4] Stala was elected into the academic senate to become prorector of science and international cooperation of the Pontifical University in Cracow for the period from 2014 until 2020.